fpga-driven led display.txt

利用FPGA驱动LED显示

FPGA驱动LED静态显示程序(1)
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
entity decoder is
Port (seg:in std_logic_vector(3 downto 0 );   --四位二进制码输入
q3:out std_logic_vector(6 downto 0) ); --输出LED七段码
end decoder;
architecture Behavioral of decoder is
begin

FPGA驱动LED静态显示程序(1)
process(seg)
begin
case seg is
when "0000" => q3<="0000001";--0   
when "0001" => q3<="1001111";--1
when "0010" => q3<="0010010";--2
when "0011" => q3<="0000110";--3
when "0100" => q3<="1001100" --4
when "0101" => q3<="0100100";--5
when "0110" => q3<="0100000";--6
when "0111" => q3<="0001111";--7
when "1000" => q3<="0000000";--8
when "1001" => q3<="0000100";--9
when others => q3<="1111111";
end case;   end process;    end Behavioral;

FPGA驱动LED动态显示（4位）
entity dynamic is	
  Port ( clk,reset: in std_logic;
	    din1 : in std_logic_vector(6 downto 0);--译码后的数据信号1    
           din2 : in std_logic_vector(6 downto 0); --译码后的数据信号2
           din3 : in std_logic_vector(6 downto 0); --译码后的数据信号3
           din4 : in std_logic_vector(6 downto 0); --译码后的数据信号4
		 shift: out std_logic_vector(3 downto 0);    --位选信号
         bus4 : out std_logic_vector(6 downto 0));            --数据信号
end dynamic;
architecture Behavioral of dynamic is
signal scan_clk:std_logic_vector(1 downto 0);


process(clk,scan_clk,reset)                       --分频进程
variable scan:std_logic_vector(17 downto 0);
begin
	if reset='1' then scan:="000000000000000000";
			     scan_clk<="00";
	elsif clk'event and clk='1'then scan:=scan+1;
	end if;
	scan_clk<=scan(17 downto 16);
end process; 

process(scan_clk,din1,din2,din3,din4)       --扫描进程
begin
   case scan_clk is
	  when "00"=> bus4<=din1;shift<="0001";
	  when "01"=>bus4<=din2;shift<="0010";
	  when "10"=>bus4<=din3;shift<="0100";
	  when "11"=>bus4<=din4;shift<="1000";
	  when others=> bus4<="0000000";shift<="0000";
	 end case;
end process;  
end Behavioral;